Weather WorldSimpson Lake, AZ Weather Forecast
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Simpson Lake Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  | | | | | | | | |
| Partly Cloudy | Sunny | Chance of T-Storm | Partly Sunny | Chance of T-Storm | Partly Sunny | Chance of T-Storm | Mostly Sunny | Chance of T-Storm | Partly Sunny | Chance of T-Storm | Partly Sunny |
| Lo: 81°FLo: 27°C | Hi: 106°FHi: 41°C | Lo: 80°FLo: 27°C | Hi: 105°FHi: 41°C | Lo: 79°FLo: 26°C | Hi: 102°FHi: 39°C | Lo: 77°FLo: 25°C | Hi: 102°FHi: 39°C | Lo: 78°FLo: 26°C | Hi: 101°FHi: 38°C | Lo: 77°FLo: 25°C | Hi: 100°FHi: 38°C |
| POP: 20% | POP: 30% | POP: 10% | POP: 20% | POP: 10% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1251 AM MST Wed Aug 19 2026 
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Issued: 1017 PM MST Tue Aug 18 2026
Key Messages
.- Temperatures will remain several degrees above daily normals through this weekend with lower desert highs ranging between 107-113 degrees and overnight lows in the mid 80s to low 90s.
- Extreme Heat Warnings are in effect through Friday evening due to widespread major HeatRisk.
- Thunderstorm activity is expected to increase in coverage through mid-week with chances returning to the south-central Arizona lower deserts as early as Wednesday.
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